Background

Adventure Guide

Under Cho'gall's control, the orcish Twilight's Hammer clan was transformed into a murderous cult obsessed with the Old Gods and their herald, Deathwing. Extended contact with his dark master has hideously warped both Cho'gall's mind and body.

Abilities

Cho'gall has a 10 minute enrage timer in all difficulty modes.

Berserk — Increases the caster's attack and movement speeds by 150% and all damage it deals by 900%. Cast after 10 minutes of combat.

Many abilities in the encounter will cause Corrupted Blood.

Corrupted Blood — Your blood is corrupted! Increases damage taken from Corruption of the Old God by 2%. Stacks to 100.

Corruption: Accelerated — Your Corrupted Blood has gone to your heart and it is accelerating! You are becoming more corrupt by the second! Causes two stacks of Corrupted Blood per second for one minute. Gained at 25% corruption. Magic dispellable.

Corruption: Sickness — Your Corrupted Blood has made you sick, causing you to vomit and inflict 39000 to 41000 Shadow damage to friends in a 5 yard cone in front of you, also causing Corrupted Blood. Happens after 50% corruption.

Corruption: Malformation — At 75% Corrupted Blood you are afflicted with Corruption: Malformation. A Malformation has grown out of your back which will cast Shadow Bolts at nearby friendly players.

Corruption: Absolute — At 100% Corruption your Corrupted Blood has corrupted you absolutely, transforming you into a Faceless One. You receive 100% less from healing but inflict 100% additional damage and spells are cast instantly.

Corruption causes and amounts:

Dark Sickness - 5

Accelerated Corruption - 2 per second

Sprayed Corruption - 5 per 2 seconds.

Spilled Blood of the Old God - +5 per second of standing in it.

Congealed Blood of the Old God melee - 2 per hit.

Corrupting Crash - 10

Depravity - 10

Festering Blood - 5

Debilitating Beam - 2 per second.

Corruption of the Old God - 1 per tick.

Stage One: Chaos Comes!

Conversion — Cho'gall beckons to the weak of mind causing the target to channel the Worshipping spell on him. Worshipping Cho'gall causes him to gain Twisted Devotion every 3 sec. Worshipping can be interrupted.

Twisted Devotion — The Worshipping has caused Cho'gall to become more zealous, increasing damage done by 10% for 20 sec.

Corrupting Crash — Fires a shadow missile at a target, dealing 43875 to 46125 Shadow damage to all enemies near the impact. Targets hit by the Corrupting Crash have corruption applied to them.

Spilled Blood of the Old God — The slain Adherent to the Old God spills its corrupted blood. Inflicts 14625 to 15375 Shadow damage to enemies within 0 yards and applies Corrupted Blood.

Fester Blood — Cho'gall festers the blood of all Corrupting Adherents, causing pools of Spilled Blood of the Old God to form into animated oozes. Fester Blood also causes the dark blood of any living Corrupting Adherents to boil, causing the Festering Blood effect.

Festering Blood — When Cho'gall uses Fester Blood, the dark blood of any living Corrupting Adherents sprays out from their bodies, inflicting 34125 to 35875 Shadow damage every 2 sec to all players within 20 yards. Players damaged by this ability will gain Corruption.

Blood of the Old God — The Corrupting Adherents' blood congeals into numerous vile oozes, each of which fixates on a random player and moves towards them. The animated Blood of the Old God raises the Corruption level of any target they melee.

Strategy

Phase One

Take Cho'gall to a corner and have the ranged group up in the center. When Cho'gall casts conversion you will need to stun, interrupt, disorient or CC the players affected and this will be much easier in a tight group. The tanks will need to switch off for Fury of Cho'gall.

When a Corrupting Adherent spawns all DPS must switch to it. You must be careful to interrupt Depravity and move out of the way of Corrupting Crash. If you gain corruption in this phase phase two will be much harder. Make certain the Corrupting Adherent dies in a corner and that the tank and melee run out as it is dying to avoid corruption from spilled blood of the old god. The add must die before Cho'gall casts Fester Blood. If you kill it in time you will then need to snare and AoE down the Congealed Blood of the Old God. Avoid being melee'd by these as they cause corruption.

Repeat the process with the next Corrupting Adherent and make certain it dies very close to the first Adherent. This time you will have twice as much blood of the old god. The third adherent will have thrice as much blood of the old god, acting as a soft enrage.

If you are close to phasing and have an adherent spawn continue damaging Cho'gall. The adherent will despawn at 25%.

Phase Two

This phase is relatively simple, you will take more damage from the AoE pulse depending on how much Corruption you gained in the first phase. If you hit 100 Corruption you cannot be healed and will die. You will still need to swap tanks for Fury of Cho'gall.

Cho'gall will spawn Darkened Creations in this phase. It is very important to interrupt and stun these so that they do not cast Debilitating Beam, which causes corruption and effectively removes a player from the fight. The first two or three waves should be killed, after that burn Cho'gall.

Tip: Cho'gall tank should move the boss to a wall when nearing phase 2. This causes the Eyes that pop up to appear in a semi-circle as oppose to all around. This lets the DPS focus fire on each eye with interrupts and killing them.

Heroic Mode

On 25-player Heroic Mode, two Corrupting Adherents will spawn at a time, which must both be killed. In addition, double the normal amount of blood will spawn during Fester Blood.

Shadow Lords and Fire Elementals will appear on Flame and Shadow's Orders that must be damaged to reduce Cho'gall's stacks of their buff.

In Phase 2, Spiked Tentacles will appear in addition to darkened creations. The raid should move away from them (as they will knock players back) and simply ignore them, as they have too much HP to efficiently kill.

Solo strategy

Pop CDs and blow him up. Don't use any abilities that summon guardians, like [Mirror Image], or Conversion casts will charm the player, resetting the encounter. Just focus on the boss and burn down his health as quickly as possible.

Related achievements

Quotes

A () denotes Gall speaking, while regular text is Cho speaking. In addition to the quotes during his fight, he will say things at various points throughout the instance, such as when Halfus Wyrmbreaker dies.

Intro

Foolish mortals - (Usurper's children!) Nothing you have done - (SPAWN OF A LESSER GOD!) I am trying to speak here! (Words, words, words! The Master wants MURDER!) All falls to chaos. ALL will be destroyed. (Chaos, chaos!) Your work here today changes nothing. (Chaos, chaos, all things END!) No mortal may see what you have and live. Your end has come.

Aggro

Enough! (To His will all flesh succumbs. From His kingdom, chaos comes!) Yes - what he said.

Patches and hotfixes

The health of Blood of the Old God on 10-player Heroic difficulty has been lowered by roughly 20%.

The health of Darkened Creations on 10-player Heroic difficulty has been lowered by roughly 20%.

The corruption gained from Corruption: Accelerated on 10-player Heroic difficulty has been lowered slightly.

Knockbacks and Deathgrip can now be used to interrupt players that are converted by Cho'gall.

Hotfix (2011-01-18): "Fester Blood now hits everyone in the room instead of having a 20-yard radius on Heroic difficulty during the Cho'gall encounter. No more kiting he who has too many eyeballs."

Hotfix (2011-01-05): "Shadow/Fire elementals are now always absorbed during the Cho’gall encounter. Elementals are absorbed no matter what amount of health they have. Cho’gall always receives the appropriate amount of the appropriate buff when consuming an elemental. The elementals are unable to fall below 1 health or otherwise be killed, so Cho’gall always gets 1 stack of the corresponding buff at minimum."

Hotfix (2011-01-03): "Flame Destruction cast during the Cho'gall encounter now does approximately 30% more damage per stack on Heroic difficulty."

Tools

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